The United States will reimpose the sanctions it imposed on Iran before the deal, and it is considering additional penalties. The move indicated that Mr. Trump, emboldened in his second year in office, is reshaping foreign policy to reflect the “America First” doctrine that he advocated during his 2016 presidential campaign, and it emphasized that trans-Atlantic relations are in trouble.

Iran’s hard-line authorities denounced the administration’s withdrawal with nationwide rallies at which American flags were burned.

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Three Americans who had been held in North Korea returned to the United States.

President Trump and his wife, Melania, were at Joint Base Andrews in Maryland early Thursday to welcome three American prisoners freed from North Korea, including Kim Dong-chul, center.CreditDoug Mills/The New York Times

The new reports detailed how Mr. Cohen, left out of the White House despite his aspirations to join the administration, became seen as someone who could help others gain access to the president. Randall L. Stephenson, AT&T’s chief executive, came forward Friday to say that the company had made a “big mistake” in hiring Mr. Cohen to advise on the company’s deal to buy Time Warner.

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Gina Haspel, the president’s nominee to lead the C.I.A., faced lawmakers’ questions over her experience.

Gina Haspel’s testimony before the Senate Intelligence Committee on Wednesday was laced with ambiguities about the C.I.A.’s detention and interrogation program and her understanding of limits on the agency’s powers.CreditTom Brenner/The New York Times

Before the hearing, Ms. Haspel told administration officials she would withdraw her nomination if there was concern that her involvement would draw theagency intorenewed controversy over the program, but she ultimately decided to remain the nominee.

During the hearing, she told senators that she would not allow another program of that nature, and she pushed back against questions about her morals. Her evasions, however, raised more questions about the ambiguities of the program and her own involvement.

And while Senator John McCain, himself a survivor of torture during the Vietnam War, released an agonized statement detailing why he could not support Ms. Haspel’s nomination, other senators have announced their intent to do so.

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Mike Pence’s brother was among the winners in a series of primary elections.

Greg Pence, Vice President Mike Pence’s oldest brother, won the Republican primary in Indiana for his brother’s former House seat, though he declined to debate his opponents and refused most requests for interviews. Representative Robert Pittenger, Republican of North Carolina, became the first incumbent from either party to lose his seat this year because of a primary challenge. And a woman who accused Mr. Trump during his presidential campaign of forcibly kissing her in Trump Tower won an uncontested Democratic primary for a seat in the Ohio House of Representatives.

At the request of Senator Mitch McConnell, Republican of Kentucky and the majority leader, Mr. Trump personally intervened in the West Virginia primary race, pleading with voters to oppose the former mine operator Don Blankenship. Mr. Blankenship, who ultimately lost the primary, had targeted Mr. McConnell with personal attacks against his wife’s ethnicity.

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New York’s attorney general, an advocate of the #MeToo movement, resigned over accusations of sexual assault.

Eric T. Schneiderman in 2017. He resigned Monday as New York’s attorney general after claims that he had physically assaulted several women.CreditSasha Maslov for The New York Times

The reports detailed Mr. Schneiderman’s alleged psychological and physical abuse of the women, crashing through his carefully cultivated reputation as a defiant opponent to Mr. Trump’s policies. He denied the charges, asserting that he engaged in “role-playing and other consensual sexual activity.”

After the accusations were reported, there was political sniping between the Manhattan district attorney, Cyrus R. Vance Jr., and Gov. Andrew M. Cuomo of New York over who should investigate them. Mr. Vance was irate over Mr. Cuomo’s decision to appoint a special prosecutor to investigate Mr. Schneiderman.